The Texas Wheelers is an American sitcom that aired in 1974 and 1975. The series, produced by MTM Enterprises, is about the cantankerous but lovable Zack Wheeler, a long-lost father who returned to raise his children Truckie, Doobie, Boo, and T.J. in rural Texas after their mother died. The theme song for the show was "Illegal Smile" by John Prine.